Passaic County Average 1999 NATA Modeled Air Concentrations Compared to Health Benchmarks

Pollutant

Modeled
Air Concentration (ug/m3)

Health
Benchmark (ug/m3)

Risk
Ratio

%
Contribution from

Major Sources

Area
Sources

On-road
Mobile Sources

Nonroad
Mobile Sources

Background

Acetaldehyde

2

0.45

5

1%

5%

59%

11%

24%

Acrolein

0.2

0.020

10

0.03%

29%

54%

17%

0%

Arsenic Compounds

0.0001

0.00023

0.4

4%

96%

0%

0%

0%

Benzene

2

0.13

15

0.08%

6%

55%

16%

23%

Bis(2-ethylhexyl)phthalate

2

0.42

4

0.07%

0.001%

0%

0%

100%

1,3-Butadiene

0.2

0.033

6

0.003%

3%

46%

16%

35%

Cadmium Compounds

0.00007

0.00024

0.3

6%

94%

0%

0.4%

0%

Carbon Tetrachloride

0.3

0.067

4

0.003%

0.6%

0%

0%

99%

Chloroform

0.01

0.043

3

0.6%

66%

0%

0%

33%

Chromium (hexavalent form)

0.0001

0.000083

1.5

4%

81%

15%

0.6%

0%

1,4-Dichlorobenzene

0.1

0.091

1.4

0.9%

99%

0%

0%

0%

1,3-Dichloropropene

0.2

0.25

1

0%

100%

0%

0%

0%

Diesel Particulate Matter

2

0.0033

583

0%

0%

44%

56%

*

Ethylene Dibromide

0.03

0.0017

19

0.02%

0.03%

0%

0%

100%

Ethylene Dichloride

0.05

0.038

1.2

0.3%

0.04%

0%

0%

99%

Ethylene Oxide

0.004

0.011

0.4

0.7%

99%

0%

0%

0%

Formaldehyde

2

0.077

29

0.7%

3%

41%

15%

40%

Methyl Chloride

1

0.56

2

0.1%

1%

0%

0%

99%

Naphthalene

0.01

0.029

4

0.2%

74%

21%

5%

0%

Nickel Compounds

0.002

0.0064

0.3

1%

95%

4%

0.3%

0%

Perchloroethylene

0.4

0.17

2

0.08%

62%

0%

0%

37%

1,1,2,2-Tetrachloroethane

0.07

0.017

4

0.03%

0.3%

0%

0%

100%

Chemicals with risk ratios greater than or equal to 1 are
in bold.
Risk Ratios in italics are based on noncarcinogenic effects.
The symbol ug/m3 is micrograms per cubic meter,
the amount (in micrograms) of a chemical in a cubic
meter of air. This is also known as a concentration.
* For diesel particulate matter, onroad and nonroad
concentrations include a model-estimated background
concentration.